Energy from the Water
Here is an excellent source of knowledge from the PowerSpout designers. Please take a look at what they have to offer.
"Even a small stream can generate consistent, clean, dam free, renewable electricity at a price per Watt lower than wind. A single PowerSpout at a site good enough to generate 1kW can produce enough electricity for a typical house for a year (>8,000 kWh/yr). The small (18 inches wide), all-weather PowerSpout PLT is one of the most reliable, cost-effective generators around because we have spent a decade making micro-hydro efficient and affordable"